[2][failed verification] In 2017, she debuted in the New South Wales 22-6 win over the Queensland women's rugby league team, scoring 3 tries on the wing.
On 8 June 2019, Sergis was named in the squad to represent New South Wales in the 2019 Women's State of Origin match.
[3] On 14 June, she extended her stay with the St. George Illawarra Dragons for the 2019 NRLW season.
[4] On 21 June, she scored one try in the Women's State of Origin match, helping the Blues to fourth-consecutive victory over Queensland.
[5] With three tries, a try assist, 21 tackle breaks and an average of 153 metres per match in three appearances in the NRLW regular season, she was named the Dally M NRLW Player of the Year at the 2019 Dally M Awards on 2 October.